Violence on Manus

Dear Prime Minister,

Manus Island has never been safe for the refugees. Yesterday, 16th February, there have been three separate violent incidents towards refugees. 

The first happened at the market in Lorengau as a refugee was walking in the rain:

Pakistani refugee Mumtaz Ali said a man ran up behind him.
”I thought that he wanted to share my umbrella with me,” he said.
”When I turned my face to him, he directly punched me on my face, on my right eye, right-side eye, then I fall on the ground and he started kicking me.”
— http://mobile.abc.net.au/news/2018-02-17/manus-asylum-seekers-allegedly-attacked-by-png-soldiers/9456790
 Black eye after attack in Lorengau.

Black eye after attack in Lorengau.

In the second attack, refugees walking to hospital were accosted. Three locals tried to steal their mobiles. Refugees pushed them away twice. The locals tried again to attack them, a car arrived and the men were able to escape.

The third attack appears to have been organised by Australia. There is video evidence of the attack:

Ten PNG soldiers from Lombrum Naval Base attacked three refugees today. Two are seriously injured, one had his face bashed by the soldiers.
Local witnesses say that the naval personnel, who were not in uniform, were very drunk and were drinking from boxes of beer.
When local people stepped in to stop the attacks, the PNG soldiers told them that Australia had sent them to control the refugees in Lorengau Town.
— https://www.facebook.com/lynne.murphy.148?ref=br_rs

Which Australian ordered the PNG navy personnel to attack the refugees?

Why hasn't anyone been charged?

Why haven't the refugees' written complaints been addressed?